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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Support modularity by calling to load a new SDCH filter dictionary.
// Note that this sort of calling can't be done in the /net directory, as it has
// no concept of the HTTP cache (which is only visible at the browser level).
#ifndef CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_
#define CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_
#include <queue>
#include <string>
#include "base/task.h"
#include "chrome/browser/url_fetcher.h"
#include "net/base/sdch_manager.h"
class SdchDictionaryFetcher : public URLFetcher::Delegate,
public SdchFetcher {
public:
#pragma warning(suppress: 4355) // OK to pass "this" here.
SdchDictionaryFetcher() : method_factory_(this), task_is_pending_(false) {}
virtual ~SdchDictionaryFetcher() {}
// Implementation of SdchFetcher class.
// This method gets the requested dictionary, and then calls back into the
// SdchManager class with the dictionary's text.
virtual void Schedule(const GURL& dictionary_url);
private:
// Delay between Schedule and actual download.
static const int kMsDelayFromRequestTillDownload = 15000;
// Ensure the download after the above delay.
void ScheduleDelayedRun();
// Make sure we're processing (or waiting for) the the arrival of the next URL
// in the |fetch_queue_|.
void StartFetching();
// Implementation of URLFetcher::Delegate. Called after transmission
// completes (either successfully or with failure).
virtual void OnURLFetchComplete(const URLFetcher* source,
const GURL& url,
const URLRequestStatus& status,
int response_code,
const ResponseCookies& cookies,
const std::string& data);
// A queue of URLs that are being used to download dictionaries.
std::queue<GURL> fetch_queue_;
// The currently outstanding URL fetch of a dicitonary.
// If this is null, then there is no outstanding request.
scoped_ptr<URLFetcher> current_fetch_;
// Always spread out the dictionary fetches, so that they don't steal
// bandwidth from the actual page load. Create delayed tasks to spread out
// the download.
ScopedRunnableMethodFactory<SdchDictionaryFetcher> method_factory_;
bool task_is_pending_;
DISALLOW_COPY_AND_ASSIGN(SdchDictionaryFetcher);
};
#endif // CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_
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